intransitive and transitive. To improvise, extemporize.

Music. To improvise or extemporize (an accompaniment, tune, etc.).

transitive. To compose and perform (music, poetry, drama, etc.) spontaneously or without preparation; to deliver (a speech) extemporaneously.

intransitive. Of a jazz musician or dancer: to improvise. Also: to dance the mess around (see Mess Around, n.). With around.

transitive and intransitive. slang. (originally Jazz) and colloquial. To improvise (esp. music); to speak or write without preparation. Also in to bu…

transitive. U.S. In African-American use: to improvise (a blues composition or blues lyrics). With up.

intransitive. To play in a ‘jam’ or ‘jam session’ (see jam, n.1 3); to extemporize. Also transitive, to improvise (a tune, etc.). colloquial…